Medical examiners have identified four people killed in a fire at a multifamily home in a Boston surburb nearly a month ago, while authorities continue investigating the cause of the blaze.

The Essex District Attorney's Office announced Thursday that the medical examiner's office identified the victims as 42-year-old Maritza Cruz Vizcaino, 36-year-old Sonia Cruz, 20-year-old Yasmin Cruz and 28-year-old Rodolfo Cruz, who were all related.